Heat recovery in energy production from low temperature heat sources

AIChE Journal ◽  
2018 ◽  
Vol 65 (3) ◽  
pp. 980-991 ◽  
Author(s):  
Doriano Brogioli ◽  
Fabio La Mantia
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Energy Production ◽  
Heat Sources ◽  
Temperature Heat

Innovative technologies for energy production from low temperature heat sources: critical literature review and thermodynamic analysis.

2021 ◽  
Author(s):  
Doriano Brogioli ◽  
Fabio LaMantia
Keyword(s):  
Low Temperature ◽  
Literature Review ◽  
Thermodynamic Analysis ◽  
Carbon Footprint ◽  
Energy Production ◽  
Scientific Community ◽  
Heat Sources ◽  
Innovative Methods ◽  
Temperature Heat ◽  
Critical Literature

The scientific community has taken on the challenge to develop innovative methods to exploit low-temperature (<100°C) heat sources, having a large potential to decrease the carbon footprint. In this review,...

Performance Improvement of a Combined Power and Cooling Cycle for Low Temperature Heat Sources Using Internal Heat Recovery and Scroll Expander

2019 ◽  
Author(s):  
Martina Leveni ◽  
Arun Kumar Narasimhan ◽  
Eydhah Almatrafi ◽  
D. Yogi Goswami
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Pressure Ratio ◽  
Internal Heat ◽  
Operating Conditions ◽  
Maximum Efficiency ◽  
Water Mixture ◽  
Heat Sources ◽  
Scroll Expander ◽  
Temperature Heat

Abstract Low temperature heat sources inherently result in lower cycle efficiencies, which can be improved by means of combined power and cooling generation. In order to produce power and cooling, appropriate thermodynamic cycles and working fluids must be used. Goswami cycle is a combined cycle that produces power and refrigeration by using ammonia-water mixture for low temperature heat sources. In the present study, a scroll expander is modeled specifically for the cycle operating conditions and a theoretical investigation is conducted to determine the cycle performance. A scroll expander design suitable for the operating conditions improves the power output and thereby overall thermal efficiency. The scroll expander efficiency varied between 0.05 and 0.61 for the pressure ratio between 2.2 and 8.6, with a maximum efficiency of 0.697 achieved at a pressure ratio of about 4.4. An internal heat recovery from the rectifier is proposed along with a flow split in the strong solution and analyzed for overall cycle energy efficiency improvement. Internal heat recovery from the rectifier increased the first law effective efficiency and the effective exergy efficiency by 7.9% and 7.8%, respectively, over the basic configuration.

The heat recovery technologies of mine waste heat sources

2017 ◽  
Vol 14 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Lingling Bao ◽  
Jiaying Wang ◽  
Jinggang Wang ◽  
Zheng Yu
Keyword(s):  
Low Temperature ◽  
Air Conditioning ◽  
Heat Recovery ◽  
Waste Heat ◽  
Mine Waste ◽  
Heat Sources ◽  
Content Type ◽  
Recovery System ◽  
Temperature Heat ◽  
Central Air Conditioning

Purpose Currently, China is the largest coal producer and consumer in the world. Underground mining is the main practice. In the process of deep mining, large amounts of low-temperature waste heat are available such as in the mine return air (MRA), mine water (MW), bathing waste water (BWW), etc. Without recycling, the low-temperature waste heat is discharged directly into the atmosphere or into the drainage system. The temperature range of the MRA is about 15-25°C, the relative humidity (RH) of the MRA is above 90 per cent, the temperature range of MW is about 18-20°C and the temperature of the BWW is about 30°C. All of the above parameters are relatively stable throughout the year, and thus MRA, MW and BWW are proper low-temperature heat sources for water source heat pump (WSHP) systems. The study aims to introduce the schemes for recycling the different waste heat sources and the relevant key equipment and technology of each waste heat recycle system; analyze the heat recovery performances of the MRA heat recovery technology; and compare the economies between the MRA heat recovery system and the traditional system. Design/methodology/approach Based on the WSHP system, heat and mass transfer efficiencies were calculated and analyzed, the outlet air velocity diffusion of the heat and mass transfer units and the parameters including air flow rate, the MRA’s dry bulb temperatures and wet bulb temperatures at inlet and outlet of MRA heat exchanger were tested. Then, it was assessed whether this system can be applied to an actual construction. An actual reconstructive project of MRA heat recovery system is taken as an example, where the cost-saving effects of heat recovery of mine waste heat sources system are analyzed. Findings Analysis of field test reveals that when heat transfer is stable, heat transfer capacity can be achieved: 957.6 kW in summer, 681 kW in winter and a large amount of heat was recycled. In an economic analysis, by comparing initial investment and 10 years’ operation cost with the traditional boiler and central air conditioning system, the results show that although the MRA system’s initial investment is high, this system can save CNY 6.26m in 10 years. Originality/value MRA has a large amount of air volume and temperature that is constant throughout the year, and hence is a good low-temperature heat source for the WSHP system. It can replace boiler heating in winter and central air conditioning refrigeration in summer. The study reveals that this technology is feasible, and has good prospects for development.

MODELING OF AN ORGANIC RANKINE CYCLE FOR LOW TEMPERATURE HEAT SOURCES

2018 ◽  
Author(s):  
Arthur Batista Martins Lott ◽  
Arthur Pacheco Luz ◽  
João Arthur Daconti Silva ◽  
Cristiana Maia ◽  
Sergio Hanriot
Keyword(s):  
Low Temperature ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Heat Sources ◽  
Temperature Heat

scholarly journals Analysis and Comparison of Some Low-Temperature Heat Sources for Heat Pumps

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1853 ◽  
Author(s):  
Pavel Neuberger ◽  
Radomír Adamovský
Keyword(s):  
Heat Transfer ◽  
Low Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Ambient Air ◽  
Heat Transfer Fluid ◽  
Heat Sources ◽  
Ground Heat Exchangers ◽  
Temperature Heat

The efficiency of a heat pump energy system is significantly influenced by its low-temperature heat source. This paper presents the results of operational monitoring, analysis and comparison of heat transfer fluid temperatures, outputs and extracted energies at the most widely used low temperature heat sources within 218 days of a heating period. The monitoring involved horizontal ground heat exchangers (HGHEs) of linear and Slinky type, vertical ground heat exchangers (VGHEs) with single and double U-tube exchanger as well as the ambient air. The results of the verification indicated that it was not possible to specify clearly the most advantageous low-temperature heat source that meets the requirements of the efficiency of the heat pump operation. The highest average heat transfer fluid temperatures were achieved at linear HGHE (8.13 ± 4.50 °C) and double U-tube VGHE (8.13 ± 3.12 °C). The highest average specific heat output 59.97 ± 41.80 W/m2 and specific energy extracted from the ground mass 2723.40 ± 1785.58 kJ/m2·day were recorded at single U-tube VGHE. The lowest thermal resistance value of 0.07 K·m2/W, specifying the efficiency of the heat transfer process between the ground mass and the heat transfer fluid, was monitored at linear HGHE. The use of ambient air as a low-temperature heat pump source was considered to be the least advantageous in terms of its temperature parameters.

scholarly journals R1234yf and R1234ze as alternatives to R134a in Organic Rankine Cycles for low temperature heat sources

2017 ◽  
Vol 142 ◽  
pp. 1192-1198 ◽  
Author(s):  
Francisco Molés ◽  
Joaquín Navarro-Esbrí ◽  
Bernardo Peris ◽  
Adrián Mota-Babiloni ◽  
Carlos Mateu-Royo
Keyword(s):  
Low Temperature ◽  
Heat Sources ◽  
Temperature Heat ◽  
Organic Rankine Cycles

A review of low-temperature heat recovery technologies for industry processes

2019 ◽  
Vol 27 (10) ◽  
pp. 2227-2237 ◽  
Author(s):  
Li Xia ◽  
Renmin Liu ◽  
Yiting Zeng ◽  
Peng Zhou ◽  
Jingjing Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Temperature Heat

scholarly journals Low temperature heat recovery in engine coolant for stationary and road transport applications

2017 ◽  
Vol 129 ◽  
pp. 834-842 ◽  
Author(s):  
Pierre Leduc ◽  
Pascal Smague ◽  
Arthur Leroux ◽  
Gabriel Henry
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Road Transport ◽  
Temperature Heat ◽  
Engine Coolant
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